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Create .htpasswd file to root directory (or anywhere) and add the username: password
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Username:Password

[Use any website or https://heyletslearnsomething.com/htpasswd-generator to encrypt the username / password


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Create .php file and keep it where the .htpasswd file to find the exact path 
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<?php
echo dirname(__FILE__) . '/.htpasswd';
?>


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Create .htaccess file and add it to Wp-admin Folder
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AuthType Basic
AuthName "Restricted Area"
AuthUserFile /path/to/.htpasswd (copy the above path)
Require valid-user

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